C#文件上传方法类(带缩略图上传方法类)
using System;
using System.Web;
using System.IO;
/// <summary>
/// 文件上传方法类
/// 作者：天纯蓝
/// 版本：0.1
/// </summary>
public class UpFiles
{
private string path = null;
private string fileType = null;
private int sizes = 0;
private int status = 0;
private int maxWith = 120;
public UpFiles()
{
///<summary>
/// TODO: 在此处添加构造函数逻辑
///</summary>
path = System.Web.HttpContext.Current.Server.MapPath("~/UpFiles"); //上传路径
fileType = "jpg|gif|bmp";
sizes = 200; //传文件的大小,默认200KB
status = 0;//1是生成小图片
maxWith = 120;//默认生成小图片最大的长度
}
/// <summary>
/// 设置上传路径
///
public string Path
{
set
{
path = value ;
}
}
///<summary>
/// 设置上传文件的类型,如:jpg|gif|bmp
///</summary>
public string FileType
{
set
{
fileType = value.ToLower();
}
}
///<summary>
/// 设置上传文件大小,单位为KB
///</summary>
public int Sizes
{
set
{
sizes = value * 1024;
}
}
///<summary>
/// 设置上传小图片最大宽度依准
///</summary>
public int MaxWith
{
set
{
maxWith = value;
}
}
///<summary>
/// 设置是否生成小图片值为1生成小图片返回图片名为(小图|大图)
///</summary>
public int Status
{
set
{
status = value;
}
}
///<summary>
/// 上传图片
/// 上传控件名称
/// true则以当前时间创建文件夹,false则为设置的文件夹
/// 返回上传图片的相对路径
/// </summary>
public string fileSaveAs(System.Web.UI.HtmlControls.HtmlInputFile Filename, bool creatDirectory)
{
try
{
string filePath = null;
string strReturnName=null;//返回的上传的文件名
//以当前时间修改图片的名字或创建文件夹的名字
string NewFileName = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString() + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString();
//获得站点的物理路径
string uploadFilePath = null;
if (creatDirectory)
{
path = path + @"\" + DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + @"\";
uploadFilePath = path + @"\";
}
else
{
uploadFilePath = path + @"\";
}
//获得文件的上传的路径
string sourceFilePath = Filename.Value.Trim();
if (sourceFilePath == "" || sourceFilePath == null)
{
message("您没有上传数据呀，是不是搞错了呀!");
return null;
}
//获得文件扩展名
string sEx = System.IO.Path.GetExtension(Filename.PostedFile.FileName).Replace(".", "");
//获得上传文件的大小
long postFileSize = Filename.PostedFile.ContentLength;
//分解允许上传文件的格式
string[] temp = fileType.Split('|');
//设置上传的文件是否是允许的格式
bool flag = false;
//判断上传文件大小
if (postFileSize >= sizes)
{
message("上传的文件不能大于" + sizes + "KB");
return null;
}
foreach (string data in temp)
{
if (data == sEx)
{
flag = true;
break;
}
}
if (!flag)
{
message("目前本系统支持的格式为:" + fileType);
return null;
}
System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(uploadFilePath);
if (!dir.Exists)
{
dir.Create();
}
filePath = uploadFilePath + NewFileName + "." + sEx;
Filename.PostedFile.SaveAs(filePath);
filePath = path + NewFileName + "." + sEx;
strReturnName = NewFileName + "." + sEx;
if (status == 1)
{
System.Net.FileWebRequest q = (System.Net.FileWebRequest)System.Net.FileWebRequest.Create(uploadFilePath + NewFileName + "." + sEx);
System.Net.FileWebResponse p = (System.Net.FileWebResponse)q.GetResponse();
int picmaxlong = maxWith;
System.Drawing.Image bmp = System.Drawing.Image.FromStream(p.GetResponseStream());
int newh;
float f;
if (bmp.Width > bmp.Height)
{
if (bmp.Width != bmp.Height)
{
f = (float)picmaxlong / (float)bmp.Width;
newh = (int)(f * (float)bmp.Height);
}
else
{
newh = maxWith;
picmaxlong = maxWith;
}
}
else
{
if (bmp.Width != bmp.Height)
{
f = (float)maxWith / (float)bmp.Height;
newh = (int)(f * (float)bmp.Width);
int newwh = newh;
newh = picmaxlong;
picmaxlong = newwh;
}
else
{
newh = maxWith;
picmaxlong = maxWith;
}
}
System.Drawing.Image.GetThumbnailImageAbort callb = null;
System.Drawing.Image image = System.Drawing.Image.FromFile(uploadFilePath + NewFileName + "." + sEx);
System.Drawing.Image newimage = image.GetThumbnailImage(picmaxlong, newh, callb, new System.IntPtr());
//把缩略图保存到指定的虚拟路径
newimage.Save(uploadFilePath + "small_" + NewFileName + "." + sEx);
//释放image对象占用的资源
image.Dispose();
//释放newimage对象的资源
newimage.Dispose();
strReturnName = "small_" + NewFileName + "." + sEx + "|" + strReturnName;
}
return strReturnName;
}
catch
{
message("出现未知错误");
return null;
}
}
private void message(string msg, string url)
{
System.Web.HttpContext.Current.Response.Write("<script language='javascript'> alert('" + msg + "');window.location='" + url + "'; </script>");
}
private void message(string msg)
{
System.Web.HttpContext.Current.Response.Write("<script language='javascript'> alert('" + msg + "'); </script>");
}
}
调用方法：例下
UpFiles upFiles = new UpFiles();
upFiles.FileType = "gif|jpg|bmp";
upFiles.Sizes = 1500;
upFiles.Path = System.Web.HttpContext.Current.Server.MapPath("~/UpFiles");
upFiles.Status = 0;
string picName = upFiles.fileSaveAs(files, false);
